Enhancement of the electrochemical performance of lithium-ion batteries by SiO2@poly(2-acrylamido-2-methylpropanesulfonic acid) nanosphere addition into a polypropylene membrane

被引:4
|
作者
Yang, Guoping [1 ]
Cai, Haopeng [1 ,3 ]
Li, Xiangyu [1 ]
Wu, Mengjun [2 ]
Yin, Xue [1 ]
Zhang, Haining [2 ]
Tang, Haolin [2 ]
机构
[1] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
[2] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[3] Wuhan Univ Technol, Inst Adv Mat Mfg Equipment & Technol, Wuhan 430070, Peoples R China
关键词
POLYMER ELECTROLYTES; ANODE MATERIAL; COMPOSITE; SEPARATOR; ELECTRODES; NANOPARTICLES; OXIDE; DESIGN; FILM;
D O I
10.1039/c9ra08273e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Employing electrostatic self-assembly and free radical polymerization, the surface of SiO2 nanospheres was coated with poly(2-acrylamido-2-methylpropanesulfonic acid) (SiO2@PAMPS) bearing strong electron withdrawing sulfonic and amide groups, enhancing the dissociation ability of the lithium salt of the liquid electrolyte and absorbing anions via hydrogen bonds. After SiO2@PAMPS nanospheres were introduced into the polypropylene (PP) membrane (SiO2@PAMPS/PP), the electrolyte affinity and electrolyte uptake of the composite separators were significantly improved. The ionic conductivity of SiO2@PAMPS/PP-18% (where 18% represents the concentration of the solution used for coating) soaked in liquid electrolyte was even 0.728 mS cm(-1) at 30 degrees C, much higher than that of the pristine PP membrane. The LiFePO4/Li half-cell with SiO2@PAMPS/PP-18% had a discharge capacity of 148.10 mA h g(-1) and retained 98.67% of the original capacity even after 120 cycles at 0.5C. Even at a rate of 1.0C, the cell capacity could be maintained above 120 mA h g(-1). Therefore, a coating formula was developed that could considerably improve the cycling ability and high rate charge-discharge performance of lithium ion batteries.
引用
收藏
页码:5077 / 5087
页数:11
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